Revit 2013 Versions are starting to show up on Autodesk Subscription and that led me on a search for the new features. I've never been too excited about the changes they've made to Revit MEP but this new version sounds like it might address many of the broken features, or at least the ones I noticed are broken. Here is where I went to see a summary of the "What's New"
First, it looks like the duct fitting database will finally be fixed. Whether that turns out to be true remains to be seen. This would be huge if it was an accurate method of calculating pressure drops like it was supposed to be all along.
Second, you can export building thermal resistance data. Again, remains to be seen how accurate/useful this will be. Will it calculate it from the architects walls or are we stuck re-inputting wall data?
Exportable pressure drop data, which kinda ties into the duct fitting database. Will be nice to export something that you can then modify. They also split pressure drop data before/after taps now. Before it would not.
Loop leaders - weee! We actually had a custom made loop symbol that we placed and drew a leader line and text to.